[PATCH 4/4] ARM: versatile: support configuring versatile machine for no-MMU
Greg Ungerer
gerg at uclinux.org
Tue Dec 6 22:59:52 PST 2016
Allow the arm versatile machine to be configured for no-MMU operation.
The approach taken is similar to the support for no-MMU arm v7 machines.
A new define, CONFIG_ARM_SINGLE_ARMV5, is used to enable a class of v5
core based machines that are supported for building with !CONFIG_MMU.
Currently only the versatile machine is configured to support this.
Older kernels had the ability to build the versatile machine with the MMU
disabled (!CONFIG_MMU). Recent changes to convert the versatile machine
to device tree lost this ability. (Although older kernels could be built
they did not run due to a bug in the IO_ADDRESS() mapping on this machine).
The motivation for this is that the versatile machine is well supported
in qemu. And this provides an excellent platform for development and
testing no-MMU support on ARM in general.
Signed-off-by: Greg Ungerer <gerg at uclinux.org>
---
arch/arm/Kconfig | 10 ++++++++++
arch/arm/Kconfig.debug | 3 ++-
arch/arm/mach-versatile/Kconfig | 3 ++-
3 files changed, 14 insertions(+), 2 deletions(-)
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index b5d529f..74a0e7a 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -353,6 +353,16 @@ config ARM_SINGLE_ARMV7M
select SPARSE_IRQ
select USE_OF
+config ARM_SINGLE_ARMV5
+ bool "ARMv5 based platforms (ARM926T)"
+ depends on !MMU
+ select AUTO_ZRELADDR
+ select CLKSRC_OF
+ select COMMON_CLK
+ select GENERIC_CLOCKEVENTS
+ select SPARSE_IRQ
+ select USE_OF
+
config ARCH_GEMINI
bool "Cortina Systems Gemini"
select CLKSRC_MMIO
diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index d83f7c3..483709e 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -1712,7 +1712,8 @@ config DEBUG_UNCOMPRESS
config UNCOMPRESS_INCLUDE
string
default "debug/uncompress.h" if ARCH_MULTIPLATFORM || ARCH_MSM || \
- PLAT_SAMSUNG || ARM_SINGLE_ARMV7M
+ PLAT_SAMSUNG || ARM_SINGLE_ARMV7M || \
+ ARM_SINGLE_ARMV5
default "mach/uncompress.h"
config EARLY_PRINTK
diff --git a/arch/arm/mach-versatile/Kconfig b/arch/arm/mach-versatile/Kconfig
index c257d40..2613f0f 100644
--- a/arch/arm/mach-versatile/Kconfig
+++ b/arch/arm/mach-versatile/Kconfig
@@ -1,12 +1,13 @@
config ARCH_VERSATILE
bool "ARM Ltd. Versatile family"
- depends on ARCH_MULTI_V5
+ depends on ARCH_MULTI_V5 || ARM_SINGLE_ARMV5
select ARM_AMBA
select ARM_TIMER_SP804
select ARM_VIC
select CLKSRC_VERSATILE
select COMMON_CLK_VERSATILE
select CPU_ARM926T
+ select GPIOLIB
select ICST
select MFD_SYSCON
select PLAT_VERSATILE
--
1.9.1
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